Swiss gold astronomic pocket watch with nine complications Circa 1927

Gold astronomical pocket watch
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An extremely fine and very rare Swiss, astronomic, minute repeating, 18K gold keyless pocket watch, circa 1927. Perpetual calendar, split-seconds chronograph, instantaneous twice 30-minute register, moon phases and lunar calendar with the original Patek Philippe mahogany fitted box, spare crystal and mainspring, original certificate. A watch with nine complications by Patek Philippe & Cie, Genève. Made for Shaefer & Hartel, Rochester, New York, sold to William E. Sloan Jr. in July 1927 for $ 1,450.
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A polished with concealed hinge, the back engraved with a small crest, bolt at 11 to lock the chronograph. Hinged gold cuvette engraved. White enamel dial with Breguet numerals, outer minute and fifths of a second division, Arabic five minute/seconds numerals, subsidiary dials for days of the week, months, subsidiary seconds with red outer date ring, minute register with inner moon phase aperture, moon’s age on the border. Blued steel spade hands. A rhodium-plated movement, Geneva striping decoration, 39 jewels, counterpoised straight-line lever escapement, cut bimetallic balance with eight adjustments, blued steel Breguet balance spring with swan-neck micrometre regulator, repeating on gongs activated by a slide on the band, split-seconds chronograph with visible work, button on the winding crown and push-piece in the band. Dial, case and movement signed.

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Diameter: 50 mm
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Signed: Patek Philippe & Cie  Genève
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It is very unusual for the original box, certificate and receipt to survive for a complicated Patek Philippe pocket watch. There are fewer than 50 triple-complication watches known and they are perhaps the most representative of Patek Philippe pocket watches. The complications of this watch are: – Perpetual calendar – Date – Day of the week – Months – Chronograph – Split-seconds – 30-minute register – Minute repeater – Moon phase and age.